Fireplace HE

[Marc M]

Anyone know what the standard is for raised fireboxes (from floor) specifically the size of the HE when there is a raised firebox?

[Dom D'Agostino]

2009 (I think) IRC:

R1004.2
Hearth extensions. Hearth extensions of approved factory-built fireplaces shall be installed in accordance with the listing of the fireplace. The hearth extension shall be readily distinguishable from the surrounding floor area.


Dom.

[Jerry Peck]

Anyone know what the standard is for raised fireboxes (from floor) specifically the size of the HE when there is a raised firebox?

Gas or solid fuel (wood)?

Either way, it is per the manufacturer's installation instructions, but a gas fireplace will not require a hearth extension - at least not the ones I've seen - provided the clearance distance above the combustible material is met. As I recall, some require 20" of clearance from the bottom of the fireplace to the floor for no hearth below it.